Exceptional Points in Random-Defect Phonon Lasers

H. Lü, S. K. Özdemir, L. M. Kuang, Franco Nori, H. Jing

Research output: Contribution to journalArticlepeer-review

96 Scopus citations


Intrinsic defects in optomechanical devices are generally viewed to be detrimental for achieving coherent amplification of phonons, and great care has thus been exercised in fabricating devices and materials with no (or a minimal number of) defects. Contrary to this view, here we show that, by surpassing an exceptional point (EP), both the mechanical gain and the phonon number can be enhanced despite increasing defect losses. This counterintuitive effect, well described by an effective non-Hermitian phonon-defect model, provides a mechanical analog of the loss-induced purely optical lasing. This opens the way to operating random-defect phonon devices at EPs.

Original languageEnglish (US)
Article number044020
JournalPhysical Review Applied
Issue number4
StatePublished - Oct 27 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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